Umm Mizrah, a 25-year-old Yemeni mother, reveals her collarbones and emaciated ribs at Al-Sadaqa Hospital in Aden, Yemen. Umm Mizrah, who is nearly into the second trimester of pregnancy, weighs 84 pounds and is severely undernourished. She has been eating one meal a day trying to feed her youngest son, who is badly malnourished.

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Aisha, a Yemeni woman, holds up her emaciated 9-month old daughter, Galila, who suffers from malnutrition and malaria, at the Stabilization Nutritional Therapeutic center in al-Khoukha, Yemen. Galila weighed 9.9 pounds, compared to the average of 13-17 pounds for a 9-month-old girl.

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Umm Molham, a Yemeni mother who is herself undernourished, struggles to hold up her malnourished 13-month-old son Molham at the Ibn Kholdoon Hospital, in Lahj, Yemen. The toddler had been vomiting, coughing and suffered from diarrhea. The family can only afford to give him formula once a day.

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Hagar Yahia makes bread, in Abyan, Yemen. Yahia and her family fled their home to escape fighting, moving 200 miles to Abyan, where they struggle to get food. Often all her eight children eat is bread and tea.

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Food hangs in sacks on the wall of the home of a displaced family, in Lahj, southern Yemen. Many markets in Yemen have food but increasing numbers of people are unable to afford it in the economic collapse caused by the war. That is one reason aid agencies warn that parts of the country will soon fall into outright famine.

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Ahmed Rashid Mokbel, a severely malnourished 7-month-old Yemeni boy, is given formula by his mother at the Al-Sadaqa Hospital in Aden, Yemen. The boy weighed only 7 pounds.

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Hagar Yahia, a Yemeni mother of eight, cries in her hut in Abyan, Yemen. Displaced from their home and scrounging for work, she and her husband can barely afford to buy enough food for their family. "I go hungry for my children. I prefer that I don't eat so they can," she said.

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Hagar Yahia holds her 5-year-old daughter Awsaf, who is suffering from malnourishment from living mainly off of bread and tea in Abyan, Yemen.

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Hagar Yahia pulls the veil off of her malnourished 5-year-old daughter, Awsaf, to feed her, in their hut in Abyan, Yemen.

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Awsaf, a 5-year-old Yemeni girl, eats bread and drinks tea _ which on many days is the only food she has _ crouching next to her mother in their hut in Abyan, Yemen. Across southern Yemen stretches a landscape of desperation, in towns, villages and camps for the displaced, families are left unable to afford food amid the civil war between Houthi rebels and a government backed by a destructive Saudi-led air campaign.

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A doctor shows on her mobile phone a photo of Fadl, an 8-month-old Yemeni boy taken in his last days before he starved to death at a hospital in Mocha, Yemen. Fadl's mother gave birth to him under a tree as she fled fighting, and ever since she struggled to get him enough food. Eight months later, at the time of his death, the baby boy weighed 6 pounds, a third of the normal weight for his age.

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Mothers and children crowd into a center for treating malnutrition at the main hospital in the town of al-Khoukha, Yemen. They left empty-handed: The center has virtually run out of supplies, even as doctors estimate 40 percent of the children in the town suffer from malnutrition.

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Staff measure the middle upper arm of Salima Ahmed Koryat, a 6-month-old Yemeni girl, to test how malnourished she is at the main hospital in Mocha, Yemen.